Yesterday, there was a bug on her, but I'm not sure if it's a tick. It was round and black, but it was about the size of an eraser on pencils. I also noticed her back was twitching.

She is an indoor cat, and has not encountered any other animals. The last time she went to a vet was 3.17.10. We also gave her a bath last month. Is it possible that she has fleas/ticks?

when you stroke your cat you can usually feel ticks like small lumps on the skin and once you spread the fur back they are a light grey colour and have their head buried underneath the skin. you cant just pull these out you have to use special tick removers that removes the whole head other wise using your fingers will leave the head behind.
buy a flea comb and groom her regularly. if small black bits come out in her fur, like bits of dirt, this can be an indication of fleas as its their faeces. if you find a flea crawling around on the comb kill it instantly because it can jump really fast! do this on a daily basis until you cant find anymore. behind the ear, neck and at the the stump of the tail are hot spots for fleas.
also buy over the counter flea treatment that you can place on the cats neck. this can be done every 3months or so keeping fleas at bay.

on the other hand the thing you saw on her back could of been an innocent creepy crawly and she could have just had an itch and twitching her back was her way of relieving it. a trip to the vets isnt needed until you actually see fleas and ticks on her and youre getting bit youreself. also check in the ears for ticks!

personal experience my cats roam in field all day and come back with ticks a lot!

You should de flea and de tick them regularly anyway, go to the vest and de flea/tick her anyway..

I think all ticks are brown not black. I can't image how it would get a tick on it if it is not around other animals or been outside. The good news is, ticks really don't reproduce fast. Chances are if you found that tick (if that's even what it was) and got rid of it, there should be no others around. I know you should use flea and tick stuff if there is a risk, but I'm not a fan of chemicals around my pets, so I say unless you notice more than just this one bug to not worry about it.

It's impossible to tell, so you should go visit the vet again.
She probably doesn't have them because she is an indoor cat.

But it is best to check, and if you don't have the money for a another vet check, weather she has fleas/ticks or not, you should wash her with something that will get rid of these pests.

glad I could help!
-Chloe

my vet
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Ya. they probably came in the house. just because she is a indoor cat does not mean she won't get those kind of things, so just get some flee/ or tick stuff to help get rid of them or you could go to your vet and see what they say but Good Luck!

i have a kitty myself and am very good with cats!

Fleas and ticks can be brought in on your clothes there transferred to your kitty.Removal of ticks can be challenging because the head of the tick may break off and continue biting. Let your Vet. or a Professional Groomer do this for you.